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Finding the Fourth Proportional to 328,611.40, 492,917.10 and 128,938.30

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Solution

The fourth proportional to 328,611.40, 492,917.10 and 128,938.30 is: 193,407.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,611.40 : 492,917.10 = 128,938.30 : x
  2. Step 2: Convert to fraction form
    328,611.40/492,917.10 = 128,938.30/x
  3. Step 3: Cross multiply
    328,611.40x = 492,917.10 × 128,938.30
  4. Step 4: Simplify right side
    328,611.40x = 63,555,892,914.93
  5. Step 5: Solve for x
    x = 63,555,892,914.93/328,611.40
  6. Step 6: Final answer
    x = 193,407.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.